BEARING SYSTEMS. TechStar Laminated Bearings (TEB)
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1 BEARING SYSTEMS TechStar Laminated Bearings (TEB)
2 1 Laminated Bearing Laminated Elastomeric Bearing (TEB) T echstar supplies many types of bearings to many regions and climates throughout the world. One type, elastomeric laminated bridge bearings (TEB), continue to provide excellent service and quality, proving invariably their efficiency and durability. TEBs have advantages over alternative metallic mechanical bearings, being easier to install, effective in corrosive environments and requiring no maintenance. These advantages are quantifiable in the economics of bridge building. and contraction) by the rubber in shear. is achieved by inserting horizontal metal plates, which do not alter the required low horizontal stiffness. Under maximum traffic and deck load the amount of vertical deflection must be limited and bearings can be precisely designed so that it does not exceed a few millimeters of which only a fraction will be due to live load. The design and positioning of the TEB allows for vertical loads (deck and traffic) to be taken by the rubber in compression and horizontal deflections (expansion Durability is ensured as a result of the bulk of rubber in the product (low surface/volume ratio) and is reinforced by the inclusion of protective chemicals which increase resistance to weathering. Expe rience has shown conclu sively that weathering of large components made of natural rubber does not affect their service lives.
3 2 Slide Bearing Sliding Laminated Elastomeric Bearing (TEB Slide) TEB Slide Bearing is applicable when horizontal displacements exceeds +/-2 inches (50mm), TEB Slide is a remunerative solution. The addition of a low-friction sliding surface allows a standard TEB bearing to accommodate unlimited horizontal displacement without increasing the height of the bearing assembly. Material Specification Elastomer Properties Laminated Bearings listed in this brochure are manufactured from Natural Rubber with a nominal hardness 60 IRHD and with the following physical properties shown below. Design Considerations A TEB Slide Bearing consists of an upper and lower plate. The lower plate includes a low-friction PTFE bonded to a carbon or stainless steel base plate, which is also bonded to the bearing. Th e performan ce d ata of TechStar s laminated bridge bearings presented in the following tables are calculated using shear moduli values appropriate to the strain in the rubber. These are indicative values for bearing selection. The maximum loads shown are calculated to the serviceability limit state as required in BS 5400 Part 9, assumin g a dead load effect numerically equal to the live load effect.
4 3 230x Top & Bottom Cover Rubber Thickness 4mm Sole Cover Rubber Thickness 6mm Steel Plate Thickness 3mm 230mm al 1TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
5 4 300x Top & Bottom Cover Rubber Thickness 4mm Sole Cover Rubber Thickness 6mm Steel Plate Thickness 3mm 300mm al 2TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
6 5 350x Top & Bottom Cover Rubber Thickness 4mm Sole Cover Rubber Thickness 6mm Steel Plate Thickness 3mm 350mm al 3TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
7 6 400x Top & Bottom Cover Rubber Thickness 4mm Sole Cover Rubber Thickness 6mm Steel Plate Thickness 3mm 400mm al 4TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
8 7 400x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 3mm 400mm al 5TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
9 8 510x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 4.5mm 510mm al 6TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
10 9 510x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 4.5mm 510mm al 7TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
11 10 600x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 4.5mm 600mm al 8TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
12 11 600x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 4.5mm 600mm al 9TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
13 12 600x Top & Bottom Cover Rubber Thickness 6mm Sole Cover Rubber Thickness 10mm Steel Plate Thickness 4.5mm 600mm al 10TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/7/ TEB/8/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/ TEB/6/ TEB/1/ TEB/2/ TEB/3/ TEB/4/ TEB/5/
14 13 Installation Notes on Installation When the requirements for bearing installation are being specified the following matters should be considered: Flatness of surface. As TEB bearings are stiff, the contact surface should be flat and irregularities should be kept small. A tolerance of ± I mm over the contact surface is normally adequate. Out of parallel. Where bearings are to be installed between preformed surfaces, the out-of-parallel tolerance between these surfaces should be specified to ensure that the combination of the bearings themselves added to the misalignment of the contact surfaces will leave sufficient rotation capacity in the bearing for working conditions. For thin bearings having a small rotation capacity, it may be advisable to form one contact surface after placing the bearings. Texture. The best contact surfaces are those that have a uniform texture and a high coefficient of friction. Smooth or slippery surfaces should be avoided. Where steel plates are used and corrosion protection is required, zinc spraying has been shown to be the most effective. Edge clearance. Contact surfaces should extend beyond the edge of the bearings to allow for tolerances on placing and ensure adequate edge support. A distance of 20 mm is generally sufficient.
15 TechStar Inc. Findlay Ohio USA Tel: +1(419) Fax: +1(419)
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